JP2014022632A - Lightning arrester and assembling method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mechanical strength and productivity of a lightning arrester.SOLUTION: A lightning arrester includes: laminated non-linear resistors 1; electrodes arranged on both ends of the non-linear resistors 1 and each having connection holes 11 therethrough; a plurality of insulation rods 5 arranged around the non-linear resistors 1 and each being inserted into the connection hole 11; wedge-shaped spacers 12, each being inserted in a gap between the connection hole 11 and the insulation rod 5; and a resin-made outer covering 9 arranged on the outer periphery of the non-linear resistors 1 and the insulation rods 5. The connection hole 11 is pierced in the longitudinal direction of the insulation rod 5, and at least one pair among opposing surfaces of the connection hole is inclined such that a non-linear resistor 1 side becomes narrow. The wedge-shaped spacer 12 includes two wedge-shaped spacer members facing to each other with the insulation rod 5 being sandwiched therebetween, each spacer member having a recession on one side surface that matches an outer shape of the insulation rod 5 and an inclination on the opposite side surface that matches the inclination of the connection hole 11.

Description

  Embodiments described herein relate generally to a lightning arrester and a method for assembling the same.

  A lightning arrester is provided as a main means for protecting power generation equipment, power transformation equipment, power transmission equipment, power distribution equipment and communication equipment from transient abnormal high voltage. As the lightning arrester, a non-linear resistor such as zinc oxide having a non-linear voltage / current characteristic in which the resistance decreases as the voltage increases is used. Examples of the lightning arrester include an insulator type arrester having an insulator outer shell and a polymer type arrester having an outer shell made of silicone rubber or the like.

  As a polymer type lightning arrester, one in which one or a plurality of disk-shaped non-linear resistors mainly composed of zinc oxide are stacked and electrodes are arranged at both upper and lower ends thereof is known.

  In order to increase the rigidity, for example, a plurality of insulating rods for tightening the non-linear resistor are arranged around the non-linear resistor element and molded by resin.

  Further, by tightening at both ends of the insulating rod, an axial force is applied to the non-linear resistor to prevent contact failure of the non-linear resistor. In a polymer type arrester using a jacket material whose mechanical strength is lower than that of an insulator type arrester, the strength of a structure including an insulating rod is constantly required to be improved.

JP 2002-151309 A

  The polymer type surge arrester is made of resin such as silicone rubber, so it cannot depend on the strength of the porcelain vessel like the insulator type arrester, and is placed around the laminated non-linear resistor. It is necessary to maintain the strength of the arrester with an insulating rod.

  In polymer lightning arresters that have been applied so far, the insulating rod is fixed to the electrodes arranged at both ends using a conical hole and a wedge-shaped part. There is a disadvantage that it is unsuitable for mass production, for example, because it has a thin-walled portion in the circumference, and the number of processing processes in production increases.

  In addition, when a conical wedge is inserted into a conical hole, it does not come into contact with the entire surface, but it comes into contact at a partial position, and the added load may be used for deformation of the wedge, and the added load becomes a frictional force. In some cases, the frictional force between the insulating rod and the wedge is insufficient. For this reason, in the lightning arrester bending test, there was a concern that the head displacement of the lightning arrester would increase.

  Then, embodiment of this invention aims at improving productivity while improving the mechanical strength of a lightning arrester.

  In order to achieve the above-described object, an embodiment of the present invention includes a non-linear resistor in which one or a plurality of layers are laminated, and two non-linear resistors disposed at both ends of the non-linear resistor and having a plurality of through-holes. A plurality of electrodes, and a plurality of insulating rods connected to each other in the circumferential direction around the non-linear resistor and inserted into the joint hole, and at least of the two electrodes A wedge-shaped spacer inserted from the outside in the longitudinal direction of the insulating rod into a space between the plurality of coupling holes of one electrode and the insulating rod inserted into the coupling hole, and the coupling hole includes the insulating hole At least one pair of mutually facing surfaces that are drilled in the longitudinal direction of the rod and that form the connection hole has an inclination so that the non-linear resistor side becomes narrower, and each wedge-shaped spacer has each of the insulating spacers. Two wedge-shaped spacer members facing each other across the rod, each having a concave surface corresponding to the outer shape of the insulating rod, and an opposite side surface having an inclination corresponding to the inclination of the coupling hole It is characterized by having.

  Further, the embodiment of the present invention is a method of assembling a lightning arrester, wherein a sandwiched nonlinear resistor is sandwiched between electrodes on both sides each having a plurality of through holes, and after the sandwiching step, Insulating rod insertion step of inserting an insulating rod into each of the electrode engagement holes, and after the insertion step, a wedge-shaped spacer is inserted and pressed between each of the engagement holes and the insulation rod to tighten the insulation rod. And a tightening step.

  According to the embodiment of the present invention, the mechanical strength of the lightning arrester can be improved and the productivity can be improved.

1 is an elevational sectional view showing a configuration of a polymer type arrester according to a first embodiment of the present invention. It is a sectional elevation showing the composition of the electrode part of the polymer type arrester concerning a 1st embodiment of the present invention. It is a conceptual bird's-eye view which shows the shape of the joint hole which is a hole of the fixing | fixed part of the insulation rod in the electrode part of the polymer type lightning arrester which concerns on the 1st Embodiment of this invention. It is a top view which shows the structure of the spacer used for the fixing | fixed part of the insulation rod in the electrode part of the polymer type lightning arrester which concerns on the 1st Embodiment of this invention. It is an elevation sectional view showing the composition of the spacer used for the fixed part of the insulating rod in the electrode part of the polymer type surge arrester concerning the 1st embodiment of the present invention. It is a flowchart which shows the assembly step of the polymer type lightning arrester which concerns on the 1st Embodiment of this invention. It is a table | surface which shows the rod single-piece | unit tension test result relevant to the 1st Embodiment of this invention. It is an elevation sectional view showing the composition of the electrode part of the polymer type surge arrester concerning the 2nd embodiment of the present invention. It is a top view which shows the structure in the joint hole of the polymer-type lightning arrester which concerns on the 2nd Embodiment of this invention. It is an elevation sectional view showing pushing of a spacer by a pushing jig in an electrode portion of a polymer type arrester according to a second embodiment of the present invention. It is a top view which shows pushing of the spacer by the pushing jig in the electrode part of the polymer-type lightning arrester which concerns on the 2nd Embodiment of this invention. It is an elevation sectional view showing the composition of the electrode part of the polymer type arrester concerning the 3rd embodiment of the present invention. It is a top view of the pushing member part after pushing in the spacer in the electrode part of the polymer-type lightning arrester which concerns on the 3rd Embodiment of this invention.

  Hereinafter, a lightning arrester and its assembling method according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is an elevational sectional view showing the configuration of the polymer type arrester according to the first embodiment of the present invention. FIG. 2 is an elevational sectional view showing the configuration of the electrode portion of the polymer type arrester according to the first embodiment of the present invention.

  The polymer type lightning arrester has a plurality of non-linear resistors 1 stacked in the center. The non-linear resistor 1 is a disk-shaped element made of a material mainly composed of zinc oxide.

  Metal plates 2a and 2b are provided at both ends of the non-linear resistor 1, and two electrodes 3a and 3b are further provided outside the metal plates 2a and 2b. The metal plates 2a and 2b and the electrodes 3a and 3b are screwed together with both screw bolts 4a and 4b, respectively. Both screw bolts 4a and 4b are formed with hexagonal holes so that they can be rotated from the outside. Both screw bolts 4a and 4b have a diameter of about 20 mm or more, for example, in consideration of the compression force in the assembly process.

  Bolt holes 8 penetrating the electrodes 3a and 3b and the metal plates 2a and 2b are also provided with bolt holes 8. The bolt through holes 7 are formed with right-handed female screws, and the bolt holes 8 Has a left-hand thread. The direction of the female screw is the right-handed screw direction so that it can be turned in the normal direction when turning both screw bolts 4a, 4b from the outside of the electrodes 3a, 3b.

  Each of the electrodes 3a and 3b has a plurality of engagement holes 11. The coupling hole 11 is provided at a position corresponding to both the electrodes 3 a and 3 b, and the insulating rod 5 is inserted into each coupling hole 11. The insulating rods 5 are made of FRP having a diameter of about 10 mm or more, and a plurality of insulating rods 5 are arranged at equal intervals in the circumferential direction around the non-linear resistor 1.

  A wedge-shaped spacer 12 is inserted from the outside of the electrodes 3a and 3b into the gap between the insulating rod 5 inserted into each of the connecting holes 11 and the connecting hole 11, and the insulating rod 5 is fixed.

  The non-linear resistor 1 and the metal plates 2a and 2b sandwiched between the electrodes 3a and 3b are entirely covered with a resin jacket, that is, a silicone resin portion 9.

  FIG. 3 is a conceptual bird's-eye view showing the shape of a joint hole which is a hole of a fixing portion of an insulating rod in the electrode portion of the polymer type arrester according to the first embodiment of the present invention. FIG. 4 is a plan view showing a configuration of a spacer used in the fixing portion of the insulating rod in the electrode portion of the polymer type arrester according to the first embodiment of the present invention, and FIG. 5 is a first embodiment of the present invention. It is an elevation sectional view showing composition of a spacer used for a fixed part of an insulating rod in an electrode part of a polymer type surge arrester concerning a form.

  As shown in FIG. 2, the connection hole 11 is provided at a plurality of locations through the electrode 3a, and the same applies to the electrode 3b. As shown in FIG. 3, the shape is inclined so that the gap between the pair of side surfaces 11a and 11b facing each other becomes narrower toward the metal plate 2a side of the electrode 3a. Moreover, the side surface 11c and the side surface 11d of the other opposing set are parallel.

  As shown in FIGS. 4 and 5, the wedge-shaped spacer 12 inserted into the gap between the insulating rod 5 and the connecting hole 11 into which the insulating rod 5 is inserted after the insulating rod 5 is inserted into the connecting hole 11 The wedge-shaped spacer members 12a and 12b are paired and are opposed to each other with the insulating rod 5 interposed therebetween.

  Of these outer surfaces, the side surfaces 12p and 12q facing in opposite directions have inclinations corresponding to the opposite side surfaces 11a and 11b of the coupling hole 11, respectively. Further, the surfaces that are in contact with the insulating rod 5 relative to each other form a concave surface that is in close contact with the outer surface of the insulating rod 5. The wedge-shaped spacer members 12a and 12b are at the thinnest part and are about 2 mm or more. The inner surface (concave surface) of the wedge-shaped spacer 12 is subjected to surface processing so as to improve the friction coefficient.

  The pair of opposing surfaces other than the pair of opposing side surface 11a and side surface 11b of the coupling hole 11 is a condition that when inserting the wedge-shaped spacer 12, the surface other than the inclined surface of the side surface 11a and the side surface 11b is not a surface that generates resistance. It is necessary to be established. As long as this condition is ensured, the opposing side surfaces other than the set of the side surface 11a and the side surface 11b may not be parallel to each other, and may not be the surfaces facing each other.

  In the state where the insulating rod 5 is coupled to the electrodes 3a and 3b, the wedge-shaped spacer 12 and the insulating rod 5 are connected to the metal of the electrodes 3a and 3b from the connection hole 11 in consideration of workability and other equipment. These are set to appropriate lengths so as not to be protrusions from the opposite surfaces of the plates 2a and 2b.

  FIG. 6 is a flowchart showing the steps of assembling the polymer type arrester according to the first embodiment of the present invention.

  First, electrodes 3a, 3a having electrodes 3a having an engagement hole 11 through which the metal plate 2a and the insulating rod 5 penetrate, and electrodes 3b having an engagement hole 11 through which the metal plate 2b and the insulation rod 5 penetrate, Bolt through holes 7 are formed in 3b, and bolt holes 8 are formed in the metal plates 2a and 2b. Thereafter, a female thread is formed in the bolt through hole 7, and a female thread in the opposite direction is formed in the bolt hole 8. At this time, it is desirable that the female screw of the bolt through hole 7 is in the right-handed screw direction (S01).

  After step S01, each of the electrode 3a and the metal plate 2a is screwed with both screw bolts 4a having male screws corresponding thereto, and the electrode 3a, the metal plate 2a, and both screw bolts 4a are combined as an integral set. Similarly, the electrode 3b, the metal plate 2b, and both screw bolts 4b are combined as an integral set (S02).

  After step S02, the laminated non-linear resistor 1 is inserted between both sets integrated in step S02. Alternatively, the laminated non-linear resistor 1 is sandwiched between both integrated sets (S03). At this time, the laminated non-linear resistors 1 are in close contact with each other, and the non-linear resistor 1 and the metal plates 2a and 2b, the metal plate 2a and the electrode 3a, and the metal plate 2b and the electrode 3b are as close as possible. Sandwiched between.

  After step S03, the insulating rod 5 is inserted into the connection holes 11 of the electrodes 3a and 3b at both ends (S04).

  After step S04, the wedge-shaped spacer members 12a and 12b of the wedge-shaped spacer 12 are inserted into the gaps between the respective coupling holes 11 formed in the electrodes 3a and 3b and the insulating rod 5 passing therethrough. Further, after the insertion, the wedge-shaped spacer 12 is pushed in by using an external device such as a hydraulic jack while the positions of the insulating rod 5 and the electrodes 3a, 3b are fixed, so that the insulating rod 5, the wedge-shaped spacer 12 and the electrode are inserted into the joint hole 11. 3a and 3b are fixed by frictional force (S05).

  After step S05, the two screw bolts 4a and 4b are turned in a direction in which the metal plate 2a and the electrode 3a are separated from each other and the metal plate 2b and the electrode 3b are separated from each other, and the metal plates 2a and 2b that are sandwiched between the electrodes 3a and 3b Then, the non-linear resistor 1 is tightened (S06).

  After step S06, the outer periphery of the non-linear resistor 1, the metal plates 2a and 2b and the insulating rod 5 sandwiched between the electrodes 3a and 3b is molded with a polymer (S07).

  In the present embodiment according to the above-described configuration and method, the wedge-shaped spacer members 12a and 12b of the wedge-shaped spacer 12 are formed in the gaps between the respective coupling holes 11 formed in the electrodes 3a and 3b and the insulating rod 5 passing therethrough. Is inserted (step S05), the contact between the opposing surface of the coupling hole 11 and the corresponding surface of the wedge-shaped spacer 12 is maintained even when the insertion depth is increased, so that the wedge-shaped spacer 12 is deformed. Partial contact is unlikely to occur.

  Further, since the thickness of the wedge-shaped spacer members 12a and 12b is about 2 mm or more, the wedge-shaped spacer 12 is not deformed when pushed.

  Further, since the shape of the joint hole 11 and the wedge-shaped spacer 12 are both square, the wedge-shaped spacer 12 does not rotate when the wedge-shaped spacer 12 is pushed in, and no twist is generated inside the polymer type arrester.

  Thus, the force for inserting the wedge-shaped spacer 12 can be effectively converted into the contact force between the corresponding surface of the corresponding coupling hole 11 on the outer side and the corresponding surface of the corresponding insulating rod 5 on the inner side.

  FIG. 7 is a table showing the result of a single rod tensile test related to the first embodiment of the present invention. The case where the connection hole is a conical shape is compared with the case of a square shape having the same shape as the present embodiment. For the square type, three results and the average value are shown. The test was performed by pulling the test jig in the axial direction against the test jig simulating the joint hole and the test fixture in which both ends of the insulating rod were fixed with spacers corresponding to the respective holes, and the tensile load was controlled by machine control. It is an increase.

  The rod diameter is the same for both the conical and square types, and the angle of the slope of the hole is adjusted. Further, the wedge-shaped spacer has the same force for pushing the wedge-shaped spacer.

  When a square hole was used, the load at which it started to slide improved by an average of about 1.4 times compared to the case of a conventional conical hole. This is because in the conventional fixing method using a conical hole and a round spacer, the diameter of the conical hole interferes with the lateral width of the spacer, so that even if the spacer is pushed in, it is not possible to obtain a force that tightens the insulating rod beyond a certain level. Because. On the other hand, in the fixing method using a square hole and a square hole spacer, the square hole and the surface where the spacer comes into contact are only two surfaces facing each other, and the square hole and the spacer do not interfere even when pushed in, and the insulation rod is sufficiently tightened. Can be obtained.

  For this reason, the rod fixing square hole provided in the electrode is not required to be a square hole as long as two opposing surfaces are inclined.

  For the above reasons, this embodiment increases the tightening force between the insulating rod and the spacer as compared with the conventional structure, and improves the load at which the insulating rod starts to slide from the fixed position when a bending load is applied. In addition, the bending load that causes mechanical destruction of the arrester is improved.

  Further, after step S05 in which the non-linear resistor 1, the metal plates 2a and 2b, the electrodes 3a and 3b, and the insulating rod 5 are all integrated, both screw bolts 4a and 4b are rotated to thereby form the electrodes 3a and 3b. The metal plates 2a and 2b and the non-linear resistor 1 that are sandwiched are tightened to improve the degree of adhesion between them, and poor contact between them can be prevented.

  As a result, the metal plates 2a, 2b and the electrodes 3a, 3b are in a direction away from each other, but conduction is ensured by the screw bolts 4a, 4b.

  Also, by managing the tightening torque of both screw bolts 4a and 4b, it is possible to easily obtain the axial force necessary to ensure the conduction of the non-linear resistor 1, etc. The necessary internal element springs can be omitted.

  Further, the connection between the metal plates 2a, 2b and both screw bolts 4a, 4b is a screw in the direction opposite to the direction of the connection between the electrodes 3a, 3b and both screw bolts 4a, 4b. At the time of fastening, the rotation of the metal plates 2a, 2b is suppressed by the friction between the non-linear resistor 1 and the metal plates 2a, 2b, and the torsion of the internal elements in the assembly process is improved. Since both screw bolts 4a and 4b have a thickness of, for example, about 20 mm or more, they have sufficient strength against a compressive load applied in such a state.

  Further, this tightening reaction force applies a tensile load to the insulating rod 5. When the insulating rod 5 is in a tensile state, the load applied to each of the wedge-shaped spacer 12 and the coupling holes 11 of the electrodes 3a and 3b acts in a direction in which the wedge-shaped spacer 12 is further inserted, and the insulating rod 5 and the electrodes 3a and 3b Is further strengthened.

  When the structure in the present embodiment as one of the factors that cause these effects is viewed in terms of production, the simple-shaped engagement hole 11 and the wedge-shaped spacer member 12a of the wedge-shaped spacer 12 that is easy to manufacture without a particularly thin portion, There is no structural complexity like the combination of 12b and the female screw corresponding to both screw bolts 4a and 4b. Further, since the thickness of the wedge-shaped spacer members 12a and 12b is about 2 mm or more, manufacturing by forging becomes possible. These points are advantageous from the viewpoint of productivity and have the effect of improving productivity.

  As described above, according to the present embodiment, the mechanical strength of the polymer lightning arrester can be improved and the productivity can be improved.

[Second Embodiment]
FIG. 8 is an elevational sectional view showing the configuration of the electrode portion of the polymer type arrester according to the second embodiment of the present invention. Moreover, FIG. 9 is a top view which shows the structure in the joint hole of the polymer-type lightning arrester which concerns on the 2nd Embodiment of this invention.

  This embodiment is a modification of the first embodiment. In the first embodiment, the coupling hole 11 is formed up to the end surface of the electrodes 3a, 3b opposite to the metal plates 2a, 2b. On the other hand, in this embodiment, it has the internal diameter which envelopes the external shape of the joint hole 11 from the end surface on the opposite side to the metal plates 2a and 2b of the electrodes 3a and 3b to the middle of the joint hole 11.

  That is, the coupling hole 11 has a circular recess 21 having a diameter that fits within the inner diameter. A female screw is formed in the circular recess 21. The wedge-shaped spacer 12 is divided into two wedge-shaped spacer members 12 a and 12 b, which are opposed to each other with the insulating rod 5 interposed therebetween.

  FIG. 10 is an elevational sectional view showing the pushing of the spacer by the pushing jig in the electrode portion of the polymer type arrester according to the second embodiment of the present invention. Moreover, FIG. 11 is a top view which shows pushing of the spacer by the pushing jig in the electrode part of the polymer type lightning arrester which concerns on the 2nd Embodiment of this invention.

  For pushing the wedge-shaped spacer 12, a pushing jig 23 in which a male screw corresponding to the female screw of the circular recess 21 is formed is used. For example, a hexagonal hole is formed on the outer end face of the pushing jig 23 so that the pushing jig 23 can be rotated. In addition, the end face to be inserted into the inner side is in contact with only the wedge-shaped spacer 12 and a concave hole is formed in the central portion that may hit the insulating rod 5 so as not to push in the central insulating rod 5. Yes.

  By appropriately managing torque using such a pushing jig 23, the wedge-shaped spacer 12 can be pushed in reliably without using an external device such as a hydraulic jack, and the working efficiency is improved.

  As described above, according to the present embodiment, the mechanical strength of the polymer lightning arrester can be improved and the productivity can be improved.

[Third Embodiment]
FIG. 12 is an elevational sectional view showing the configuration of the electrode portion of the polymer type arrester according to the third embodiment of the present invention. FIG. 13 is a plan view of the pushing member portion after pushing the spacer in the electrode portion of the polymer type arrester according to the third embodiment of the present invention.

  This embodiment is a modification of the second embodiment. In the second embodiment, a circular depression 21 is provided in the coupling hole 11 of the electrodes 3a and 3b, and a pushing jig 23 that fits the circular depression 21 is used to push the wedge-shaped spacer 12. On the other hand, in this embodiment, the pushing member 22 that fits the circular depression 21 is a part of the component.

  The pushing member 22 is formed with a male screw corresponding to the female screw of the circular recess 21. For example, a hexagonal hole is formed on the outer end surface of the pushing member 22 so that the pushing member 22 can be rotated. In addition, the end face to be inserted into the inner side is in contact with only the wedge-shaped spacer 12 and a concave hole is formed in the central portion that may hit the insulating rod 5 so as not to push in the central insulating rod 5. Yes.

  In the state where the wedge-shaped spacer 12 is pushed in, the upper end of the pushing member 22 does not protrude outward from the end face opposite to the metal plates 2a and 2b of the electrodes 3a and 3b, and is the same face as the end face of the electrode or the inner side in the axial direction. The length of the pushing member 22 in the axial direction is set.

  The pushing of the wedge-shaped spacer 12 by inserting the pushing member 22 is performed in the step of pushing the wedge-shaped spacer 12 in step S05 of the first embodiment.

  In the present embodiment using the above-described configuration and method, the wedge-shaped spacer 12 can be inserted and pushed in reliably and easily. Further, since the pushing member 22 holds the insertion position of the wedge-shaped spacer 12 during the service period, the connection between the electrodes 3a and 3b and the insulating rod 5 due to the looseness of the wedge-shaped spacer 12 is reduced, and the strength of the entire lightning arrester. The problem of lowering can be avoided.

  As described above, according to the present embodiment, the mechanical strength of the polymer lightning arrester can be improved and the productivity can be improved.

[Other Embodiments]
As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. In each embodiment, the case of a polymer type arrester in which improvement of mechanical strength is particularly desired has been shown as an example. However, the present invention is not limited to a polymer type arrester, and has similar internal elements such as a porcelain insulator and a metal tank. It can also be applied to other types of lightning arresters covered with.

  Moreover, in each embodiment, although the example which performs the coupling | bonding of the electrode and insulating rod by a wedge-shaped spacer by providing an engagement hole in both electrodes is shown, it does not necessarily need to perform about both electrodes, for example, one electrode For the above, the insulating rod may be thickened so as not to come out of the mating hole, and the contents of each embodiment may be applied to the other.

  Further, screwing both screw bolts to the electrode and the metal plate may be performed for the electrode on one side.

  Moreover, you may combine the characteristic of each embodiment.

  Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Nonlinear resistor 2a, 2b ... Metal plate 3a, 3b ... Electrode 4a, 4b ... Both screw bolt 5 ... Insulating rod 7 ... Bolt through-hole 8 ... Bolt Hole 9 ... Silicone resin part (jacket)
DESCRIPTION OF SYMBOLS 11 ... Joint hole 11a, 11b, 11c, 11d ... Side surface 12 ... Wedge-shaped spacer 12a, 12b ... Wedge-shaped spacer member 12p, 12q .... Side surface 21 ... Circular hollow part 22 ...・ Pushing member 23 ... Pushing jig

Claims (10)

A non-linear resistor in which one or more are laminated,
Two electrodes disposed at both ends of the non-linear resistor and having a plurality of through-holes;
A plurality of insulating rods that connect the electrodes and are circumferentially spaced around the non-linear resistor, and are inserted into the mating holes;
A wedge-shaped spacer inserted from the outside in the longitudinal direction of the insulating rod into a gap between the plurality of coupling holes of at least one of the two electrodes and the insulating rod inserted into the coupling hole;
With
The mating hole is formed in the longitudinal direction of the insulating rod, and at least one set of mutually facing surfaces forming the mating hole has an inclination such that the non-linear resistor side becomes narrow,
Each of the wedge-shaped spacers is opposed to each other with the insulating rod in between, and one side surface has a concave surface corresponding to the outer shape of the insulating rod, and the opposite side surface is inclined corresponding to the inclination of the joint hole. Two wedge-shaped spacer members comprising
A lightning arrester characterized by that. At least one of the two electrodes is disposed on the non-linear resistor side, and has a bolt hole provided in the longitudinal direction of the insulating rod from the electrode side. A metal plate on which a female screw is formed;
Both screw bolts formed on the opposite side of the metal plate side male screw and the electrode side male screw in the opposite direction to the metal plate side male screw;
Further comprising
The electrode has a bolt through-hole in the longitudinal direction of the insulating rod at a position facing the bolt hole, and is screwed into at least a part of the bolt through-hole with the electrode-side male screw of both screw bolts. With electrode side female thread,
The lightning arrester of Claim 1 characterized by the above-mentioned.   The lightning arrester according to claim 1 or 2, wherein the inner surface of the wedge-shaped spacer is surface-treated so as to improve a friction coefficient.   4. The lightning arrester according to claim 1, wherein the insulating rod and the wedge-shaped spacer do not protrude outside from the connection hole. 5.   2. A circular recess having an inner diameter that envelops the outer shape of the coupling hole is formed on the outer side in the longitudinal direction of the insulating rod of the coupling hole, and a hollow female screw is formed in the recess. Item 5. The lightning arrester according to any one of items 4.   The male screw corresponding to the hollow female screw is formed, a hole capable of accommodating the top of the insulating rod is formed, and further includes a pushing member that pushes the wedge-shaped spacer without pushing the insulating rod by being driven to rotate. 5. A lightning arrester according to 5.   The lightning arrester according to claim 6, wherein the pushing member has a top portion located inside the outer surface of the electrode after pushing the wedge-shaped spacer. A method of assembling a lightning arrester,
A sandwiching step of sandwiching the laminated non-linear resistor with electrodes on both sides each having a plurality of through holes;
After the sandwiching step, an insulating rod insertion step of inserting an insulating rod into each of the connection holes of the electrode, and
After the inserting step, a tightening step of tightening the insulating rod by inserting and pushing a wedge-shaped spacer between each of the coupling holes and the insulating rod;
A method of assembling a lightning arrester, comprising: Before the sandwiching step, a metal plate mounting step for connecting a metal plate to the non-linear resistor side of at least one of the electrodes with both screw bolts screwed to the metal plate,
After the tightening step, an additional step of rotating the both screw bolts in a direction opposite to the coupling side to tighten the non-linear resistor and apply a tensile force to the insulating rod;
The method of assembling the lightning arrester according to claim 8, further comprising:   The method of assembling a lightning arrester according to claim 9, further comprising a jacket mounting step of providing a resin jacket on the outer periphery of the nonlinear resistor and the insulating rod after the adding step.

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